They were filed away and for nearly 150 years, but now researchers have found the report of the young army surgeon who was first to reach Abraham Lincoln after he was shot in the head in Ford Theatre.

The 21-page report, written by Dr Charles Leale, a 23-year-old doctor just six weeks into his medical practice who happened to be 40 feet from Lincoln, details his original perceptions of the president’s fatal injuries.

The historians who discovered the report in the National Archives in Washington believe it was filed, packed in a box, stored at the archives and not seen for 147 years.

Loss of a president: John Wilkes Booth, an actor and Southern nationalist, shot and killed President Abraham Lincoln during a performance at the Ford's Theatre

Clinical report: Dr Charles Leale, 23, the first to treat Lincoln after he was shot, wrote a detailed report on his treatment hours after the shooting; the documents were recently discovered at the National Archives

Discovery: 147 years after the shooting, a researcher has discovered an original copy of Dr Leale's clinical 21-page report from the night Lincoln was shot

The doctor, who sat 40 feet from Lincoln at Ford's Theatre that night in April 1865, saw John Wilkes Booth jump to the stage, brandishing a dagger, and heard the cry that the 'President has been murdered' before pushing his way through the crowd.

Great Emancipator: Lincoln was shot dead by John Wilkes Booth at Ford's Theatre in 1865, when Mr Seymour was five years old

Thinking Lincoln had been stabbed, Dr Leale ordered men to cut off the president's coat.

'I commenced to examine his head (as no wound near the shoulder was found) and soon passed my fingers over a large firm clot of blood situated about one inch below the superior curved line of the occipital bone,' Dr Leale reported.

‘The coagula I easily removed and passed the little finger of my left hand through the perfectly smooth opening made by the ball, and found that it had entered the encephalon.'

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Dr Leale’s long-lost report also states that he immediately ‘sent a gentleman for brandy and water,’ and that he found the Great Emancipator ‘in a state of general paralysis.’

He describes: ‘His eyes were closed and he was in a profoundly comatose condition, while his breathing was intermittent and exceedingly stertorous.’

A researcher for the Papers of Abraham Lincoln, Helena Iles Papaioannou, found it among correspondence of the U.S. surgeon general from April 1865, filed under 'L' for Leale.

'What's fascinating about this report is its immediacy and its clinical, just-the-facts approach,' Daniel Stowell, director of the Papers of Abraham Lincoln, told the Associated Press. 'There's not a lot of flowery language, not a lot of emotion.'

Physicians have long debated whether Mr Lincoln could have lived with modern medicine. Trauma treatment was virtually unknown in 1865, and Dr Leale's report illustrates 'the helplessness of the doctors,' Mr Stowell said. 'He doesn't say that but you can feel it.'

Loss of a leader: An artist's rendering that appeared in Harper's Weekly depicts the grisly murder from another angle

Help nearby: Seymour didn't realize the president had been shot, but saw Booth, when he had fallen from the balcony

Dr Leale wrote a report for an 1867 congressional committee investigating the assassination that referenced the earlier account, but no one had ever seen it, said Mr Stowell, whose group's goal is to find every document written by or to Abraham Lincoln during his lifetime.

At least four researchers have been painstakingly scouring boxes of documents at the National Archives for more than six years.

They methodically pull boxes of paper - there are millions of documents packed away and never catalogued, Mr Stowell said - and look for 'Lincoln docs,' as Ms Papaioannou called them.

Assassination site: Ford's Theatre, located in Washington, D.C., was playing 'Our American Cousin' on April 14, 1865

Consequences: On July 7, 1865, three men and one woman were hanged in Washington for their parts in the crime: Mrs. Mary Surratt, Lewis Powell, David Herold, and George Atzerodt

She was assigned the surgeon general's documents and was leafing through letters pitching inventions for better ambulances and advice about feeding soldiers onions to ward off disease when she hit Dr Leale's report.

'I knew it was interesting. What we didn't know was this was novel,' Ms Papaioannou said. 'We didn't know that this was new, that this was an 1865 report and that it likely hadn't been seen before.'

The surgeon never spoke or wrote about his experiences again until 1909 in a speech commemorating the centennial of Lincoln's birth.

The Papers of Abraham Lincoln, administered by the Abraham Lincoln Presidential Library and Museum in Springfield, has found and is digitizing 90,000 documents, Mr Stowell said.

'O, DOCTOR, DO WHAT YOU CAN FOR HIM': REPORTS FROM A PHYSICIAN ATTEMPTING TO SAVE THE LIFE OF THE GREAT EMANCIPATOR

I arrived at Ford’s Theatre about 8¼ P.M. April 14/65 and procured a seat in the dress circle about 40 feet from the President’s Box. The play was then progressing and in a few minutes I saw the President, Mrs Lincoln, Major Rathbone and Miss Harris enter; while proceeding to the Box they were seen by the audience who cheered which was reciprocated by the President and Mrs Lincoln by a smile and bow.

The party was preceded by an attendant who after opening the door of the box and closing it after they had all entered, took a seat nearby for himself.

The theatre was well filled and the play of “Our American Cousin” progressed very pleasantly until about half past ten, when the report of a pistol was distinctly heard and about a minute after a man of low stature with black hair and eyes was seen leaping to the stage beneath, holding in his hand a drawn dagger.

While descending his heel got entangled in the American flag, which was hung in front of the box, causing him to stumble when he struck the stage, but with a single bound he regained the use of his limbs and ran to the opposite side of the stage, flourishing in his hand a drawn dagger and disappearing behind the scene.

I then heard cries that the 'President had been murdered,' which were followed by those of 'Kill the murderer' 'Shoot him' etc. which came from different parts of the audience.

I immediately ran to the Presidents box and as soon as the door was opened was admitted and introduced to Mrs. Lincoln when she exclaimed several times, 'O Doctor, do what you can for him, do what you can!' I told her we would do all that we possibly could.

When I entered the box the ladies were very much excited. Mr. Lincoln was seated in a high backed arm-chair with his head leaning towards his right side supported by Mrs. Lincoln who was weeping bitterly. Miss Harris was near her left and behind the President.

While approaching the President I sent a gentleman for brandy and another for water.

When I reached the President he was in a state of general paralysis, his eyes were closed and he was in a profoundly comatose condition, while his breathing was intermittent and exceedingly stertorous.

I placed my finger on his right radial pulse but could perceive no movement of the artery. As two gentlemen now arrived, I requested them to assist me to place him in a recumbent position, and as I held his head and shoulders, while doing this my hand came in contact with a clot of blood near his left shoulder.

Supposing that he had been stabbed there I asked a gentleman to cut his coat and shirt off from that part, to enable me if possible to check the hemorrhage which I supposed took place from the subclavian artery or some of its branches.

Before they had proceeded as far as the elbow I commenced to examine his head (as no wound near the shoulder was found) and soon passed my fingers over a large firm clot of blood situated about one inch below the superior curved line of the occipital bone.

The coagula I easily removed and passed the little finger of my left hand through the perfectly smooth opening made by the ball, and found that it had entered the encephalon.

As soon as I removed my finger a slight oozing of blood followed and his breathing became more regular and less stertorous. The brandy and water now arrived and a small quantity was placed in his mouth, which passed into his stomach where it was retained.

Dr. C. F. Taft and Dr. A. F. A. King now arrived and after a moments consultation we agreed to have him removed to the nearest house, which we immediately did, the above named with others assisting.

When we arrived at the door of the box, the passage was found to be densely crowded by those who were rushing towards that part of the theatre. I called out twice 'Guards clear the passage,' which was so soon done that we proceeded without a moments delay with the President and were not in the slightest interrupted until he was placed in bed in the house of Mr Peterson, opposite the theatre, in less than 20 minutes from the time he was assassinated.